diff -r e19cb4c11409 -r 299f6a8faccc src/HOL/Isar_Examples/document/root.tex
--- a/src/HOL/Isar_Examples/document/root.tex	Tue Mar 09 20:00:44 2021 +0100
+++ b/src/HOL/Isar_Examples/document/root.tex	Tue Mar 09 21:11:05 2021 +0100
@@ -1,5 +1,5 @@
 \documentclass[11pt,a4paper]{article}
-\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
 \usepackage[only,bigsqcap]{stmaryrd}
 \usepackage{ifthen,proof,amssymb,isabelle,isabellesym}
 \isabellestyle{it}